Progress® Telerik® UI for WPF Feedback Portal

Detailed Information

When developing an application using Telerik's RadHighlightTextBlock control, I encountered the following issues:

When attempting to dynamically update the control's `Text` and `HighlightText` properties through data binding, the control fails to display the updated content correctly. Specifically:

After updating property values in the ViewModel, RadHighlightTextBlock doesn't display the new text content
Even if the text updates, the highlighted portion doesn't correctly reflect the new HighlightText value
The control's UI display is inconsistent with the actual values in the data model

I have confirmed that:

Data binding paths are correct
ViewModel implements INotifyPropertyChanged
Other controls bound to the same data source update correctly

I suspect this might be an issue with RadHighlightTextBlock's internal update handling mechanism, or it may require specific settings to properly handle dynamic update scenarios.

My Code:

MainWindow.xaml

<Window x:Class="RadHighlightTextBlock_Issue.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:RadHighlightTextBlock_Issue"
        xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Window.Resources>
        <local:MyViewModel x:Key="MyViewModel"/>
    </Window.Resources>
    <StackPanel>
        <telerik:RadHighlightTextBlock x:Name="highlightTextBlock" 
                                       Text="{Binding Source={StaticResource MyViewModel}, Path=SelectedItem.Description}"
                                      HighlightText="{Binding Source={StaticResource MyViewModel}, Path=SelectedItem.HighlightText}"
                                      HighlightForeground="Red"
                                      HighlightBackground="Yellow"
                                      FontSize="16"
                                      Margin="10"/>
        <telerik:RadButton Content="Content0" Command="{Binding Source={StaticResource MyViewModel}, Path=C0Command}"/>
        <telerik:RadButton Content="Content1" Command="{Binding Source={StaticResource MyViewModel}, Path=C1Command}"/>
    </StackPanel>
</Window>

MainWindow.xaml.cs

using System;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Windows;
using System.Windows.Input;

namespace RadHighlightTextBlock_Issue
{
    /// <summary>
    /// MainWindow.xaml 的互動邏輯
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void RadButton_Click(object sender, RoutedEventArgs e)
        {
            highlightTextBlock.Text = "This is a sample text to demonstrate the RadHighlightTextBlock control.";
        }

        private void RadButton_Click_1(object sender, RoutedEventArgs e)
        {
            highlightTextBlock.Text = "This is another sample text for the second button.";
        }
    }

    public class MyViewModel : INotifyPropertyChanged
    {
        public ObservableCollection<DataItem> Items { get; set; }
        public MyViewModel()
        {
            Items = new ObservableCollection<DataItem>
            {
                new DataItem { HighlightText = "sample", Description = "This is a sample description." },
                new DataItem { HighlightText = "second", Description = "This is the second item description." },
                new DataItem { HighlightText = "text", Description = "This item contains the word text." }
            };

            SelectedItem = Items.FirstOrDefault();
        }

        public ICommand C0Command => new RelayCommand<object>((obj) =>
        {
            SelectedItem = Items.FirstOrDefault();
        });

        public ICommand C1Command => new RelayCommand<object>((obj) =>
        {
            SelectedItem = Items.LastOrDefault();
        });

        private DataItem _selectedItem;
        public DataItem SelectedItem
        {
            get { return _selectedItem; }
            set
            {
                if (_selectedItem != value)
                {
                    _selectedItem = value;
                    OnPropertyChanged();
                }
            }
        }

        public event PropertyChangedEventHandler PropertyChanged;

        protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = "")
        {
            var handler = PropertyChanged;
            if (handler != null)
            {
                handler(this, new PropertyChangedEventArgs(propertyName));
            }
        }
    }

    public class DataItem
    {
        public string HighlightText { get; set; }
        public string Description { get; set; }
    }

    /*Implement RelayCommand...*/
}

Has anyone encountered a similar issue? Is there any way to resolve it?
Thank you all.

RadHighlightTextBlock — Text binding stops updating when HighlightText is used

Detailed Information

My Code:

MainWindow.xaml

MainWindow.xaml.cs